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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1fe508d6632bf3720e7048fff7fce234b46283538b009fa718f6f2ec6f56cf7' 
  AND token = 'P2HigNLm0NfEGEznNSU17hCcEtVyo4D5ZUT47X5s3vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}